Electrical Engineering

12:00 AM

@Asmyldof Do you think that if I can distort the optical output of a screen, then I can repair the need for close up glasses for others

The Photon

Anybody know how to figure out if my cheap cell phone will work in another country?

Asmyldof

No, because it's a focal issue and a loss of pixel issue. You can only make the image less defined, whereas you need over-defining, which can't be processed due to diffusion in following optics and low res pixels

The Photon

Supposedly it supports "CDMA/Tri-Band LTE".

Asmyldof

@ThePhoton depends on which phone and which country

The Photon

and "CDMA Bands Class 1/10/0, LTE Bands 25/26/41"

Does that mean anything to anybody?

Asmyldof

12:03 AM

Not yet

Marla

@Asmyldof You seem very confident. But I propose that one could project an image, that when viewed without correction, the image would be clear.

granted, a distorted image

Asmyldof

That would require anti-light to be possible in your screen

The Photon

@Marla Only if you can also control the optical phase of the light reflecting from the image.

You could do it with a hologram.

Marla

much like when Ray Dolby proposed to record a distorted image onto audio tape. The world was agahst

The Photon

@Marla audio phase is a lot easier to control than optical phase.

Asmyldof

12:05 AM

Yes, but

What He says

Shalvenay

@ThePhoton it sounds North American only

the lack of GSM support's a pretty dead giveaway :P

The Photon

@Shalvenay Thanks, that's kind of what I thought.

Marla

@ThePhoton Yes, however, with the proper distortion, I am wondering

Asmyldof

Also, our ears are much smarter than our eyes, when it comes to complex phase processing

The Photon

@Shalvenay I thought GSM was the old stuff. My old candy bar phone had GSM. (but probably on the wrong frequencies for other countries)

Marla

12:06 AM

@Asmyldof Very good, the mind can correct too

Shalvenay

@ThePhoton GSM is the old stuff (2G) -- but the lack of support for it means they don't care aobut anything whatsoever outside N. America

Asmyldof

@Marla Point is, we have a sensor in the front of our face that is by default extremely indiscriminate about phases and tuning, with a single pinhole lens system

Marla

@Shalvenay so what exactly was the solution ? Getting the other "master" or other source off of the line ?

Shalvenay

@Marla rebooting got the other "master" off the line

Marla

I struggled with the image. Glad you solved it

Asmyldof

12:10 AM

Our ears are designed to detect phase shifts and volume imbalance and have echo and compensation and weird constructs

Marla

@Asmyldof The mind can accept and translate so well

Interestingly, translate, what we "think" is the correct answer

Asmyldof

You know those parallax 3D screens?

Marla

@Asmyldof I am not challenging your comment

Asmyldof

When they finally make those so they don't give you headaches and an actually proper image, I think we may be 30 to 40% on the way to your idea

Schaaf says I should hide under the couch until a princess comes to rescue me

Marla

Does she have to kiss yo before you become human ?

you

Asmyldof

12:17 AM

@Marla I think we all know I'm not going to be human any way

Marla

oh, I didn't know that a human had to be annointed before it became human. . . . . Don't be silly, of course you are human

Asmyldof

@Marla beep boop

Marla

although you do have some peculiarities

Asmyldof

Do you mean the floating?

I can walk if that's easier to look at

Marla

are you trying out for the "most human" of the year ?

Asmyldof

12:21 AM

I tried for least annoying in my house last year and still lost

:P

Marla

You are intriguing and at the same time frustrating at the same time. You really should just be you. Did you know that girls like a guy just because he is what he is ?

Asmyldof

Nah, they used to.

I feel like flying somewhere far away

for no reason

But it has no wings :/

Marla

paging Dr. Freud,, paging Dr. Freud , urgent need in sector 5

Asmyldof

3

Marla

or was that a section 8 ?

Asmyldof

12:26 AM

.3.

Ooh

I thought I had a thought but I think I thought wrong

Marla

don't mis-confuse us

egads, I just realized you speak dutch. Mis-confuse us , , was supposed to be funny

Asmyldof

Me speakadeeEnglish

But me also got up 19 hours ago

Marla

yeah, and me speek-a-anything

Asmyldof

Ti shi ha sai tsao

Marla

say good night Asmyldof :)

Asmyldof

12:31 AM

Por que?

Marla

not spanish

nor Portugese

Asmyldof

Je ne parle pas les Africains, je suis tres desolé

ok, you got me there

:-P

Yo no hablo 3$%&&)))

12:33 AM

L3375P34K?

Marla

no, data- $^^$$ and then AND #%^&^& ,

see, I can be silly gtoo

too

Asmyldof

o.O

Marla

gtoo

Asmyldof

I'm seconds away from putting on my tap shoes and dancing on the keyboard

Marla

when your bottle of rum runs low, we will chat again

Asmyldof

12:35 AM

Have no rum

:'(

Going to organise my tomorrow stuff and off to bed

:-D

Nite

Marla

good night Asmyldof

Shubham

5:16 AM

Hi fellow engineers, I had a quick question about control system terminology.

I'm working on some documentation that talks about op-amp feedback instability, and I need to describe it terms of the damping [something].

In this context, what is the correct term? damping constant, damping factor, damping ratio?

Nick Alexeev

5:42 AM

@Shubham There's damping ratio.

jippie

morning

@Asmyldof Doesnt FakeMoustache work in Eindhoven?

Asmyldof

8:37 AM

@jippie dunno

PlasmaHH

9:00 AM

moooh

Asmyldof

9:16 AM

mööööph?

PlasmaHH

9:43 AM

exactly

Asmyldof

11:14 AM

@PlasmaHH Any hints as to what process normally creates or updates resolv.conf?

Asmyldof

11:24 AM

Oh and also, what else can I put in your IPA box?

PlasmaHH

@Asmyldof generally that file is either managed by the distro specific scripts and processes (in case of static configuration; those might include processes like NetworkManager) or in case of dhcp, by the dhcp solutions scripts. the most common ones seem to be dhclient and dhcpcd which then can start scripts configured in special directories (just like the rc.d startup scripts)

@Asmyldof do you have a 3W LED with particular good CRI? The wife isn't convinced yet that ordinary lidl LEDs won't do so I could show her the difference...

@Asmyldof is someone overwriting it? if your system has audit support you might be able to figure out which process it is

/etc/sysconfig/network/scripts/dhcpcd-hook* scripts are those on my suse system btw.

Asmyldof

11:41 AM

@PlasmaHH Don't think I have any reliable CRIs in stock at the moment, no

@PlasmaHH No, it's in the tmp folder, so it gets cleaned out, but I don't know why the old distro worked for both stat and dhcp, and mine, while I touched only Dropbear, doesn't work for stat

Just have the cheap LEDs, they're stable enough, sure, but not really a good reliable curve out of the box

Still looking for a new supplier for "this is the actual, exact curve" LEDs

And then I'll find the one with the best curve for whatever purpose my customers need it for

PlasmaHH

@Asmyldof the path to the resolv.conf is hardcoded into the libc, and usually is /etc/resolv.conf ... when you say its in the tmp folder, does that by chance mean it is generated there and just not copied over? or is it linked from /etc/ to the tmp folder?

@Asmyldof ah ok, would have been nice to get one from someone who knows about these instead of ordering from the interwebs and hoping that the promises are true ^^

Asmyldof

@PlasmaHH It's symlinked from etc to tmp

And I opted to not touch anything more than I had already promised to put my finger into, so I just decided to ignore that, since for me it worked primo

But never tried static IP at home

PlasmaHH

if your libc has debug support, you can add

options debug

to the resolv.conf and it should output something

Asmyldof

You mean the resolv.conf that gets cleaned out at startup?

As in, see who cleans it, or?

Because..

How does that help?

PlasmaHH

ah, then I got the point where it gets cleaned wrong

usually distros have points where they completely clean tmp ... some do it at bootupt, some do it at shutdown...

Asmyldof

11:56 AM

@PlasmaHH either way, if I change it and call reboot, it'll get regenerated next boot

And there is probably a reason for that, and I don't want to also discover that reason, so I would strongly prefer to just make it so that when it goes into static IP it also creates it somehow

PlasmaHH

you could possibly hack aruond this cleanup by creating that file with the immutable attribute... anything wanting to touch it will probably not be able to handle that

Asmyldof

Yes, I can even just put it in /etc/ but again, I don't want to touch the cleanup, because undoubtedly there is an undocumented reason for it, because the default distro for this "system" comes with the normal /etc/ situation

And I want to avoid getting even more calls even later in the year about other issues caused by an old rexolv.conf or whatever

PlasmaHH

might make debugging easier though? or can you boot with whatever contents of that file you want?

ok, so just to refresh my memory, there seems to be something messed up... what are the symptoms of the dns problems? getting no response? always? sometimes?

Asmyldof

12:52 PM

@PlasmaHH DHCP did proper DNS'ing

Static didn't

I saw in the log he sent it coldn't find Resolv.conf

He made a resolv.conf by hand with a dns server in it: worked

But old system, pre-me, always worked fine with static IP

So now I think DHCP nicely creates a resolv.conf, while static doens't

Yup, the system at my place cleanly receives the nameserver tokens from my router

and puts them in tmp/resolv.conf

I think maybe they put it in tmp (ramdisk as it turns out now) because it needs to be boot-generated and yaffs cannot be trusted? At least this version

PlasmaHH

for the dhcp setup?

Asmyldof

Yah, my home just runs on DHCP, no fiddly stuff

PlasmaHH

or in tmp/ramdisk because at the point where they needed it, the yaffs was not writeable yet? often things are mounted read only and later remounted rw

Asmyldof

I've had shit with the yaffs stuff

but, well, eh

maybe, either way

I'm not happy to fiddle with it, lest I invite 3 whole new avalanches on myself

PlasmaHH

so it comes down to how that distro creates the /etc/resolv.conf in case of static setup...

mine would probably create it from information in /etc/sysconfig/network/config or so...

Asmyldof

12:59 PM

Hm

Any easy way to retrieve the DNS information for a router when not using DHCP utilities?

PlasmaHH

in some distros they would save the created resolv.conf elshwere and upon wanting to generate a new one compare if the one there is the saved one. If not, they will not generate a new one, assuming the user knew what he did and manually edited it

Asmyldof

I can just add something to the start script that dumps them into the resolv.conf always

PlasmaHH

dhcpcd-test ethX

Asmyldof

doesn't have that :'(

PlasmaHH

hm, is it running dhclient for dhcp?

Asmyldof

1:11 PM

In a way, I think, I believe that's inside busybox

udhcpc is supported it seems from

busybox.net/downloads/BusyBox.html

PlasmaHH

1:23 PM

hm, that doesnt seem to be able to show the information, however it has this -s script file option.... it seems that it sets some environment variables that this script then will process... if you run it with a script that will simply otuput all environment variables, my guess would be that some of them are dhcp options

Asmyldof

1:35 PM

hm

The default script adds the dns' to the resolv.conf

But....

:/ what did I break in case of static configuration

PlasmaHH

my guess is that after the tmp erasure, nothing ever recreates that file

Asmyldof

Yes, but, then, why does the old image work fine?

And/or have any good ideas to have it created for a manual IP situation?

External tools that I can compile myself allowed

(<= 1.5MB of tools at least)

PlasmaHH

@Asmyldof I would probably to some comparison and check how the file comes to life there...

@Asmyldof where does the manual situation get its information from? if it is only ever configured by you, I would put a resolv.conf at some place and copy it to /tmp or so

Asmyldof

1:54 PM

hm

I think I have found something

PlasmaHH

does it make funny noises?

Asmyldof

Noh :'(

No, there's a network file on the SD, that configures DHCP=1 or DHCP=0

and also has a DNS, DNS2, IP

I'll tell them to just add some DNSs there when they disable DHCP

And echo the contents of those values into the resolv.conf

sort-of-fix

PlasmaHH

well, yeah, they need to configure dns in some way anyways, so there or somewhere else... doesnt really mater

Asmyldof

Just asked the guy "Is it right you change this file to achieve it?"

I think in the old system someone just made the resolv.conf tbh, since there is nothing about DNS in the net script

PlasmaHH

"everyone will be using dhcp, we will deal with this later"

Asmyldof

2:02 PM

mhm

Asmyldof

2:24 PM

Does möööph have some kind of meaning?

PlasmaHH

it is kind of the transliteration of the sound honking makes and is used in some situations where it is supposed to be funny

Asmyldof

Aaaaah\

PlasmaHH

like I poke my finger at your nose and say "mööööp". Funny after a few or more beers

(or if you are 4 years old)

Asmyldof

Or apparently a 27yr old woman

PlasmaHH

can happen too

Asmyldof

2:26 PM

Everytime I ask what a möööph is I get a completely random and incoherent question back

PlasmaHH

so she kinda lieks you...

Asmyldof

shrug

PlasmaHH

We also have some derivative words that are used in interesting contexts:

Ruthe.de - Kopfkirmes

►

Asmyldof

2:41 PM

....

k

Only a few more functions and my FW will be ready for initial demo.

Then begins the horror of @#$#$%@$%!^&%%^# MDIO

Branden Boucher

4:18 PM

There was no way that video could have NOT been German

The Photon

4:43 PM

@BrandenBoucher I dunno, with all those Ö's, I thought at first it might be Turkish.

Branden Boucher

4:55 PM

lol

I don't know if I can classify that video as SFW

jippie

5:49 PM

morning

W5VO

mornin all

Asmyldof

6:04 PM

I'm beered up!

Not very well though :/

Branden Boucher

6:36 PM

I think I know how to fix that

Asmyldof

No beer

:/

Mast

Get some.

Asmyldof

Fair point

Asmyldof

6:55 PM

Going home then!

PlasmaHH

8:02 PM

argh, another scratch on my wristwatch :/

jippie

@PlasmaHH can easily be solved

PlasmaHH

@jippie I dont think I want to know your definition of easy in this case...

jippie

@PlasmaHH I haven't scratched my watch in over ten years.

PlasmaHH

you are storing it in a drawer in your desktop?

jippie

no .. but the idea is pretty similar

PlasmaHH

8:41 PM

@Asmyldof did you buy multiple of the cheap chinese flux pens? Are they ok? You might want to give me one for testing, optionally filled ;)

though probably in the process of moving I will find three or more old ones under some cupboards... ^^

Asmyldof

9:15 PM

@PlasmaHH ah yes, I can fill a fake BonPen for you, no worries

Prefer water based or IPA based?

PlasmaHH

those that I had to far were all alcohole based I think, so that is what I would go with

jippie

night

Why are close votes from the main page not shown in the summary of the review queue?

I've been close-voting several questions today and it still shows 0.

on my profile page it says 10 for today ..

grmbl

Asmyldof

@jippie Sleep waffly

@PlasmaHH Those you used before will probably also be rosin based, I only have none-rosin Organic base. 2.1.3 and 2.2.3 from Multicore brand

Because those can actually be easily cleaned using IPA or even a soft cloth

PlasmaHH

ah, thats fine, I have a bit of 223 gel that I am often using, its fine

Asmyldof

I'll make it 223 then, X33-12i from Henkel/Multicore/Loctite

datasheets availably online

PlasmaHH

9:27 PM

good. henkel makes flux? or is that all one big company now?

Asmyldof

The latter

Been for ages

PlasmaHH

never noticed... henkel is known mostly for its glue here

Asmyldof

As is Loctite....

Which has been Henkel since the dawning of... something

I think under the name of Loctite they bought/merged it with Multicore

PlasmaHH

in the end, everything is probably a daughter of alphabet ^^

Asmyldof

I guess I can deduct €10,- from your budget for that

uk.rs-online.com/web/p/solder-fluxes/4259379

:-P

PlasmaHH

9:33 PM

hehe... I have always read and heard about multicore stuff but never used it... I only rarely saw it in some shop and always was thinking the logo looks so old fashioned, who knows how long the stuff was lying around there

Asmyldof

:-D

mmmm 60 hour week

But, got a lot done

PlasmaHH

the last time I had a significantly more than 40 hours week was in my army times, that was some 168 hour weeks though ;)

Asmyldof

My record has been 122, just as a nerd :-)

Only gun holding I have done was for the experience/research at ranges

PlasmaHH

(I don't count the times at university where I wasn't working int he sense of getting payd)

Asmyldof

If getting paid is a requirement I haven't even got many 45+ weeks

As in paid directly per hour

But the 122 was 40 as employee and 82 starting my company

PlasmaHH

9:38 PM

nah, generally paid for whatever you do...

Asmyldof

2nd week in

PlasmaHH

the hardest thing coding stuff was at some airbus project, 28 hours without much break, all in a hangar at ~40°C in some spanish backlands

Asmyldof

Oh, I have it the other way around, day and a half in -5

But with a builder hut with coffee nearby

Advantage is the last 6 hours you don't feel the cold all that much anymore

PlasmaHH

and all to prove that those goddamn morons that built the hardware had a massive hysteresis of almost 0.6mm in their machine

Asmyldof

Though I don't doubt I was within a hair of having operable frostbite

Thing is, with morons, you see, that they think 0.6mm is negligible

PlasmaHH

9:46 PM

they clearly had no idea about the dimensions involved... I mean that thing is like 72m long, how much lever there is to amplify 0.6mm into "doesn't fit at this end anymore" ...

not to talk about the increase in fuel consumption

there is a reason why for the A340 longliner they went back to a german company ^^

Asmyldof

9:57 PM

blah blah arrogant blah blah :-P

PlasmaHH

11:17 PM

hmpf, thats annoying... I dont have any new smd transistors, only used ones... and none of them works in my oscillator circuit :/

PlasmaHH

11:31 PM

ok, guess what doesnt work when you hook up power the wrong polarity...

Branden Boucher